RFR 8068887 : java.lang.Throwable could use Collections.emptyList for suppressedException

[Vyom Tewari]

Hi All,

Please review my changes for below bug.

Bug:            JDK-8068887 : java.lang.Throwable could use 
Collections.emptyList for suppressedException
Webrev: http://cr.openjdk.java.net/~vtewari/8068887/webrev.00/webrev/

This change ensure that  fewer classes are loaded in a simple(hello 
world) program, and thus a very very small start-up footprint improvement.

Thanks,
Vyom